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Q:

A lytic infection concludes with the

A) production of a prophage B) production of messenger RNA
C) embedding of viral DNA into the host cell's DNA D) bursting of the host cell
 
Answer & Explanation Answer: D) bursting of the host cell

Explanation:
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Q:

Which of the following statements is most accurate regarding infection with parvovirus B19?

A) Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors B) Parvovirus B19 can cause hydrops fetalis via transplacental infection of a fetus in a seropositive mother
C) Parvovirus B19 can be diagnosed by detection of viral RNA using PCR or hybridization assays D) Parvovirus B19 replicates in the host cell nucleus utilizing a virally encoded DNA polymerase to create a double- stranded DNA intermediate
 
Answer & Explanation Answer: A) Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors

Explanation:

Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors.

 

a. Parvovirus B19 binds preferentially to the erythrocyte blood group P antigen on erythroid precursor cells.

Answers B, C, D are incorrect:

b. after entry the single-stranded viral DNA genome is transported to the cell nucleus where the host DNA polymerase synthesizes the complimentary DNA strand.

c. Parvovirus B19 infection can be diagnosed by direct detection of viral DNA not RNA.

d. the fetus of a seropositive mother is protected from infection by maternal circulating antibodies.

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Q:

The impression of an image persists on the retina for about _________ of a second.

A) 1/10th B) 1/8th
C) 1/16th D) 1/5th
 
Answer & Explanation Answer: C) 1/16th

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Q:

Rearrange the parts of the sentence in correct order.
There is a deeper
P-fissure here that goes
Q-from western theory
R-beyond explanations

A) PRQ B) PQR
C) QPR D) RPQ
 
Answer & Explanation Answer: A) PRQ

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Q:

Select the antonym of
mishmash

A) potpourri B) medley
C) organized D) haphazard
 
Answer & Explanation Answer: C) organized

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Q:

The element present in all organic molecules is

A) Hydrogen B) Oxygen
C) Carbon D) None of the above
 
Answer & Explanation Answer: C) Carbon

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Filed Under: Chemistry
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Q:

Which organelles are unique to plant cells?

A) Central vacuole B) Chlorophyll
C) Cell wall D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:
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Q:

Which planet do most known extrasolar planets most resemble?

A) Neptune B) Venus
C) Jupiter D) Earth
 
Answer & Explanation Answer: B) Venus

Explanation:

Most known extrasolar planets most resemble to the planet Venus.

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